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+Khronos has released the OpenGL man page XML sources. This was done
+mostly at the request of people wishing to adapt the man pages to other
+output formats or language bindings.
+
+You will need to have a reasonable understanding of Subversion, Docbook,
+XML, XSLT, Linux package management (if using Linux), and other
+components of the toolchain used to generate the man pages, before
+you're likely to have much success with them. A great deal of Docbook,
+XML, and XSL infrastructure may need to be installed on your system
+first.
+
+The directory tree containing the man pages is available for anonymous,
+read-only checkout in Khronos' Subversion server, at
+
+    https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/docs/man/
+
+If you have the Subversion command-line client installed, you should be
+able to check out the man pages into the directory 'man' by executing
+the command
+
+    svn co --username anonymous --password anonymous https://cvs.khronos.org/svn/repos/ogl/trunk/ecosystem/public/sdk/docs/man/ man
+
+Under 'man' you'll find the OpenGL 2.1 man pages, both the Docbook XML
+source in this directory and generated XHTML+MathML in xhtml/ , and some
+supporting build and XSL infrastructure. There are two files in the
+OpenGL.org Wiki containing additional documentation:
+
+http://www.opengl.org/wiki/index.php/Getting_started/XML_Toolchain_and_Man_Pages#Toolchain
+  - Description of the tools used to build the man pages; how to install
+    and make use of them if you want to build them yourself; and how to
+    report problems.
+
+http://www.opengl.org/wiki/index.php/Getting_started/Viewing_XHTML_and_MathML
+  - Some notes on viewing XHTML+MathML documents in different browsers.
+
+------------------------------------------------------------------
+
+Special note on DTDs: the normal Docbook build process generates a
+DOCTYPE header with references to the DTD
+
+    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"
+
+While in principle this is only a namespace identifier, Internet
+Explorer nonetheless downloads the DTD, and the entity files referenced
+from within it, on every page loaded. This contributes to creating
+unacceptable load on www.w3.org, and the IE user agent has been blocked
+for these URLs. Ideally Microsoft would fix IE, but in the meantime, the
+only workaround within our control is to cache copies of the DTD and
+entity files locally in the generated xhtml/ directory and postprocess
+the generated XHTML to refer to them. This explains the presence of the
+files
+
+    xhtml/xhtml1-transitional.dtd
+    xhtml/xhtml-lat1.ent
+    xhtml/xhtml-special.ent
+    xhtml/xhtml-symbol.ent